Charging circuit, method, vehicle, storage medium and program product for a vehicle

Abstract

Embodiments of the present application provide a charging circuit, a method, a vehicle, a storage medium and a program product of a vehicle. The charging circuit comprises a direct current charging port, a three-bridge-arm sub-circuit and a first filter module. The three-bridge-arm sub-circuit comprises a first bridge arm, a second bridge arm and a third bridge arm, a first inductor, a second inductor and a third inductor. The direct current charging port is connected with a first end of the first inductor, a first end of the second inductor and a first end of the third inductor respectively. A second end of the first inductor and a midpoint of the first bridge arm are connected, a second end of the second inductor and a midpoint of the second bridge arm are connected, and a third end of the third inductor and a midpoint of the third bridge arm are connected. The first filter module is connected in parallel with the first bridge arm, the second bridge arm and the third bridge arm between positive and negative output ends of a bus. Through the above circuit, the compatibility of high and low voltage charging can be realized without increasing the cost of the whole vehicle.

Description

Technical Field

[0001] This application relates to the field of new energy, and in particular to a charging circuit, method, vehicle, storage medium, and program product for a vehicle. Background Technology

[0002] The charging rate of new energy vehicles has always been an important factor affecting users' purchase of new energy vehicles. To improve the charging rate of new energy vehicles, high-voltage charging platforms (such as 800V platforms) have become the mainstream solution.

[0003] In related technologies, to ensure that new energy vehicles equipped with high-voltage charging platforms are compatible with early-deployed low-voltage (e.g., 400V) charging piles, a DC boost converter can be added to the existing charging platform for voltage boosting, or the motor windings and power devices of the electronic control system can be reused to achieve voltage boosting.

[0004] However, the above-mentioned solutions result in higher overall vehicle costs. Summary of the Invention

[0005] This application provides a vehicle charging circuit, method, vehicle, storage medium, and program product, which can effectively reduce the overall vehicle cost.

[0006] In a first aspect, embodiments of this application provide a charging circuit for a vehicle, including: a DC charging port, a three-bridge sub-circuit, and a first filter module; the three-bridge sub-circuit includes: a first bridge arm, a second bridge arm, and a third bridge arm, a first inductor, a second inductor, and a third inductor;

[0007] The first bridge arm includes a first switch and a second switch connected in series; the second bridge arm includes a third switch and a fourth switch connected in series; and the third bridge arm includes a fifth switch and a sixth switch connected in series.

[0008] The DC charging port is connected to the first end of the first inductor, the first end of the second inductor, and the first end of the third inductor, respectively; the second end of the first inductor is connected to the midpoint of the first bridge arm, the second end of the second inductor is connected to the midpoint of the second bridge arm, and the third end of the third inductor is connected to the midpoint of the third bridge arm.

[0009] The first filtering module is connected in parallel with the first bridge arm, the second bridge arm, and the third bridge arm between the positive and negative output terminals of the bus.

[0010] Optionally, the charging circuit further includes an AC charging port, a first switching module, and a voltage conversion sub-circuit;

[0011] The AC charging port is connected to the first end of the first switch module, and the second end of the first switch module is connected to the first end of the first inductor, the first end of the second inductor, and the first end of the third inductor, respectively.

[0012] The voltage conversion sub-circuit is connected in parallel with the first filter module between the positive and negative output terminals of the bus.

[0013] The first end of the first switch module is also connected to the DC charging port.

[0014] Optionally, the voltage conversion sub-circuit includes: a first voltage conversion unit, a second voltage conversion unit, a third voltage conversion unit, and a second filtering module;

[0015] The third voltage conversion unit is connected to the first voltage conversion unit and the second voltage conversion unit respectively. The second voltage conversion unit is connected in parallel with the second filter module, and the first voltage conversion unit is connected in parallel with the first filter module.

[0016] Optionally, the first voltage conversion unit includes a fourth bridge arm and a fifth bridge arm, the second voltage conversion unit includes a sixth bridge arm and a seventh bridge arm, and the third voltage conversion unit includes a transformer, a fourth inductor, a third capacitor, and a fourth capacitor.

[0017] The fourth bridge arm includes a fifth and a sixth switch connected in series; the fifth bridge arm includes a seventh and an eighth switch connected in series; the sixth bridge arm includes a ninth and a tenth switch connected in series; and the seventh bridge arm includes an eleventh and a twelfth switch connected in series.

[0018] The fourth inductor and the third capacitor are connected to the low-voltage side of the transformer, and the fourth capacitor is connected to the high-voltage side of the transformer.

[0019] The fourth inductor is connected to the midpoint of the fifth bridge arm, the third capacitor is connected to the midpoint of the fourth bridge arm, the fourth inductor is connected to the midpoint of the seventh bridge arm, and the low-voltage side of the transformer is connected to the midpoint of the sixth bridge arm.

[0020] Optionally, the charging circuit further includes a second switching module and a third switching module;

[0021] The second switch module is connected in series with the first filter module between the positive and negative output terminals of the bus, and the third switch module is deployed in the bus for connecting the DC charging port and the battery.

[0022] Optionally, the third switch module includes: a third sub-switch module, a third switch, a fourth switch, and a ninth switch, wherein the third sub-switch module includes a first switch, a second switch, and a first resistor;

[0023] The second switch is connected in series with the first resistor and then in parallel with the first switch;

[0024] The third switch and the third switch module are connected in series in the positive line to the busbar, and the fourth switch and the ninth switch are connected in series in the negative line to the busbar.

[0025] Optionally, the charging circuit may also include a filter sub-circuit and a pre-charge sub-circuit;

[0026] The first end of the filter sub-circuit is connected to the AC charging port, the second end of the filter sub-circuit is connected to the first end of the pre-charging sub-circuit, and the second end of the pre-charging sub-circuit is connected to the first end of the first switching module.

[0027] Secondly, embodiments of this application provide a method for charging a vehicle, the method being used to control a charging circuit as described in any of the first aspects, the method comprising:

[0028] When the vehicle is detected to be connected to the charging pile, the charging mode is determined according to the connected charging port; the charging mode includes DC charging mode and AC charging mode.

[0029] Obtain the charging strategy corresponding to the charging mode; the charging strategy is used to indicate the on / off state of the switching module in the charging circuit;

[0030] The charging strategy controls the corresponding switching module in the charging circuit to open or close.

[0031] Optionally, the charging mode is a DC charging mode, and the method further includes:

[0032] Obtain the maximum output voltage of the charging pile;

[0033] If the maximum output voltage is greater than or equal to the preset voltage, the current charging mode is determined to be a high-voltage DC charging mode; if the maximum output voltage is less than the preset voltage, the current charging mode is determined to be a low-voltage DC charging mode.

[0034] The corresponding switch module in the charging circuit is controlled to open or close according to the charging strategy corresponding to the high voltage DC charging mode or the low voltage DC charging mode.

[0035] Optionally, if the charging mode is AC charging mode, the method further includes:

[0036] Obtain the type of AC power in the AC charging mode; the type includes single-phase AC power and three-phase AC power;

[0037] Determine the corresponding AC charging strategy based on the type of AC power.

[0038] The corresponding switch module in the charging circuit is turned on or closed according to the AC charging strategy.

[0039] Thirdly, this application provides a vehicle including: the charging circuit described in any of the first aspects.

[0040] Fourthly, this application provides a computer-readable storage medium having a computer program stored thereon, the computer program being executed by a processor to implement the method of any of the first aspects.

[0041] Fifthly, this application provides a computer program product, including a computer program that, when executed by a processor, implements the method of any one of the first aspects.

[0042] This application provides a charging circuit, method, vehicle, storage medium, and program product for a vehicle. The charging circuit includes a DC charging port, a three-bridge sub-circuit, and a first filter module. The three-bridge sub-circuit includes a first bridge arm, a second bridge arm, and a third bridge arm, a first inductor, a second inductor, and a third inductor. The first bridge arm includes a first and a second switch connected in series; the second bridge arm includes a third and a fourth switch connected in series; and the third bridge arm includes a fifth and a sixth switch connected in series. The DC charging port is connected to the first terminal of the first inductor, the first terminal of the second inductor, and the first terminal of the third inductor. The second terminal of the first inductor is connected to the midpoint of the first bridge arm, the second terminal of the second inductor is connected to the midpoint of the second bridge arm, and the third terminal of the third inductor is connected to the midpoint of the third bridge arm. The first filter module is connected in parallel with the first, second, and third bridge arms between the positive and negative output terminals of the bus. This circuit achieves compatibility between high and low voltage charging without increasing the overall vehicle cost. Attached Figure Description

[0043] Figure 1 A schematic diagram of a charging circuit provided in an embodiment of this application. Figure 1 ;

[0044] Figure 2 A schematic diagram of a charging circuit provided in an embodiment of this application. Figure 2 ;

[0045] Figure 3 A schematic diagram of a charging circuit provided in an embodiment of this application. Figure 3 ;

[0046] Figure 4 A schematic diagram of a charging circuit provided in an embodiment of this application. Figure 4 ;

[0047] Figure 5 A schematic diagram of a charging circuit provided in an embodiment of this application. Figure 5 ;

[0048] Figure 6 A schematic flowchart of a charging method provided in an embodiment of this application;

[0049] Figure 7 This is a schematic diagram of the structure of a charging device provided in an embodiment of this application;

[0050] Figure 8 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Detailed Implementation

[0051] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0052] In the embodiments of this application, the terms "first" and "second" are used to distinguish identical or similar items with essentially the same function and effect, without limiting their order. Those skilled in the art will understand that the terms "first" and "second" do not limit the quantity or execution order, and that the terms "first" and "second" do not necessarily imply that they are different.

[0053] It should be noted that, in the embodiments of this application, the terms "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design scheme described as "exemplary" or "for example" in this application should not be construed as being more preferred or advantageous than other embodiments or design schemes. Specifically, the use of terms such as "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0054] Currently, with the development of new energy technologies, more and more consumers are choosing new energy vehicles. At the same time, consumers' expectations for new energy vehicles are also constantly increasing, with higher requirements placed on aspects such as driving range, user experience, and charging time.

[0055] To improve charging speed, current new energy vehicle charging platforms are constantly being upgraded, with high-voltage platforms (e.g., 800V) becoming the mainstream platform. However, high-voltage platforms are incompatible with previously deployed low-voltage charging piles (e.g., below 750V). To improve the utilization efficiency of charging piles, a charging solution that is compatible with both low and high voltage is needed.

[0056] Among the relevant technologies, there are the following two implementation methods:

[0057] Method 1: Add a DC boost converter to the vehicle's charging platform to boost the input voltage of the low-voltage charging pile.

[0058] Method 2: Reuse motor windings and power devices in electronic control to achieve voltage boost.

[0059] However, adopting method one would add an extra component, leading to an increase in the weight and cost of the entire vehicle; adopting method two would place high demands on the motor's pulsating torque, winding current imbalance control strategy, and motor lifespan during charging, resulting in higher component development costs.

[0060] In view of this, embodiments of this application provide a charging circuit, charging method, vehicle, storage medium, and program product for a vehicle. By switching the switch in the charging circuit, compatibility between high-voltage and low-voltage charging can be achieved without adding new components, which is simple and convenient.

[0061] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be implemented independently or in combination with each other. The same or similar concepts or processes may not be described again in some embodiments.

[0062] Figure 1 A schematic diagram of a charging circuit provided in an embodiment of this application. Figure 1 ,like Figure 1 As shown, the charging circuit includes: a DC charging port, a three-bridge arm sub-circuit, and a first filter module.

[0063] The three-bridge arm sub-circuit includes: a first bridge arm, a second bridge arm, and a third bridge arm, a first inductor L1, a second inductor L2, and a third inductor L3.

[0064] In some embodiments, the first filtering module may include a first capacitor C1.

[0065] The first bridge arm includes a first switch D1 and a second switch D2, which are connected in series between BUS+ and BUS-. BUS+ is the positive output terminal of the bus, and BUS- is the negative output terminal of the bus. For example, the first end of the first switch D1 is connected to BUS+, the second end of the first switch D1 is connected to the first end of the second switch D2, and the second end of the second switch D2 is connected to BUS-. The common terminal of the first switch D1 and the second switch D2 is called the midpoint of the first bridge arm.

[0066] The second bridge arm includes a third switch D3 and a fourth switch D4, which are connected in series between BUS+ and BUS-. For example, the first end of the third switch D3 is connected to BUS+, the second end of the third switch D3 is connected to the first end of the fourth switch D4, and the second end of the fourth switch D4 is connected to BUS-. The common end of the third switch D3 and the fourth switch D4 is called the midpoint of the second bridge arm.

[0067] The third bridge arm includes a fifth switch D5 and a sixth switch D6, which are connected in series between BUS+ and BUS-. For example, the first end of the fifth switch D5 is connected to BUS+, the second end of the fifth switch D5 is connected to the first end of the sixth switch D6, and the second end of the sixth switch D6 is connected to BUS-. The common end of the fifth switch D5 and the sixth switch D6 is called the midpoint of the third bridge arm.

[0068] The first inductor L1 is connected to both the DC charging port and the first bridge arm. For example, the first end of the first inductor is connected to the DC charging port, and the second end of the first inductor is connected to the midpoint of the first bridge arm. The second inductor L2 is connected to both the DC charging port and the second bridge arm. For example, the first end of the second inductor is connected to the DC charging port, and the second end of the second inductor is connected to the midpoint of the second bridge arm. The third inductor L3 is connected to both the DC charging port and the third bridge arm. For example, the first end of the third inductor is connected to the DC charging port, and the third end of the third inductor is connected to the midpoint of the third bridge arm.

[0069] The first capacitor C1 is connected between BUS+ and BUS-. That is, the first bridge arm, the second bridge arm, the third bridge arm, and the first capacitor C1 are connected in parallel between BUS+ and BUS-.

[0070] In some embodiments, the switching transistors in the three-bridge arm sub-circuit can be power MOSFETs or IGBTs (Insulated Gate Bipolar Transistors).

[0071] In some embodiments, the DC charging interface is further connected to the positive and negative output terminals of the bus via a busbar. Optionally, a switching switch is provided between the DC charging interface and the positive and negative output terminals of the busbar, respectively.

[0072] In some embodiments, a switching switch is provided between the first inductor L1 and the DC charging interface. For example, the switch is connected to the first end of the first inductor and the DC charging port, respectively.

[0073] The charging circuit provided in this application embodiment can achieve compatibility between DC high-voltage charging and low-voltage charging. When the voltage of the current input to the charging pile through the DC charging interface is greater than or equal to the preset voltage (e.g., 800V, high-voltage charging), the switching switch between the first inductor L1 and the DC charging interface is turned off, and the switching switch between the DC charging interface and the bus is turned on. The current in the charging pile passes through the DC charging port and directly charges the battery through the bus.

[0074] If the voltage of the current input to the charging pile through the DC charging interface is less than the preset voltage (e.g., 800V, low-voltage charging), the switching switch between the first inductor L1 and the DC charging interface is turned on, and the switching switch between the DC charging interface and the bus is turned off. The current in the charging pile is boosted through the three-bridge arm sub-circuit and the first capacitor C1 to realize the high-voltage charging pile charging the battery.

[0075] The following section explains the process by which the three-bridge arm circuit and the first inductor boost the input current.

[0076] like Figure 1 As shown, the first inductor L1 is connected in series with the first bridge arm of the three-bridge sub-circuit to form the first Boost circuit, the second inductor L2 is connected in series with the second bridge arm of the three-bridge sub-circuit to form the second Boost circuit, and the third inductor L3 is connected in series with the third bridge arm of the three-bridge sub-circuit to form the third Boost circuit.

[0077] The first Boost circuit performs a single-stage voltage boosting of the input current, the second Boost circuit performs a second-stage voltage boosting, and the third Boost circuit performs a third-stage voltage boosting. By using these three Boost circuits connected in parallel and interleaved, the low-voltage input current is increased to a high-voltage current (e.g., increasing a 400V current to 800V). The boosted current is then filtered (or regulated) by the first capacitor C1 to remove ripple voltage from the DC current, resulting in a smooth and stable DC voltage, thus enabling the low-voltage charging station to charge the battery.

[0078] The current flow direction of the first Boost converter circuit can be as follows:

[0079] The first stage: the positive terminal of the DC charging port - the first inductor L1 - the second switch D2 - the negative terminal of the DC charging port form the energy storage circuit of the first inductor.

[0080] The second stage: the positive terminal of the DC charging port - the first inductor L1 - the second switch D1 - the negative terminal of the DC charging port form the boost circuit of the first inductor.

[0081] The current flow direction of the second and third Boost converters is similar to that of the first Boost converter, and will not be described again here.

[0082] The charging circuit provided in this application embodiment can achieve both high-voltage charging and low-voltage charging without adding new components, thus reducing the overall vehicle cost.

[0083] Figure 2 A schematic diagram of the charging circuit provided in the embodiments of this application. Figure 2 ,like Figure 2 As shown, the charging circuit also includes: an AC charging port, a first switching module, and a voltage conversion sub-circuit.

[0084] The AC charging port is connected to the first end of the first switch module, and the second end of the first switch module is connected to the first end of the first inductor, the first end of the second inductor, and the first end of the third inductor, respectively.

[0085] The voltage conversion sub-circuit is connected in parallel with the first filter module between the positive and negative output terminals of the bus, and the first terminal of the first switch module is also connected to the DC charging port.

[0086] When the three-bridge arm sub-circuit and the voltage conversion sub-circuit work together, the charging circuit can also realize the charging function based on AC power. Specifically, when charging with AC power, the three-bridge arm sub-circuit is used to rectify the input AC power, and the voltage conversion sub-circuit is used to boost the DC power obtained after conversion.

[0087] In some embodiments, such as Figure 3 As shown, the voltage conversion sub-circuit includes: a first voltage conversion unit, a second voltage conversion unit, a third voltage conversion unit, and a second filtering module.

[0088] The third voltage conversion unit is connected to the first voltage conversion unit and the second voltage conversion unit respectively. The second voltage conversion unit is connected in parallel with the second filter module, and the first voltage conversion unit is connected in parallel with the first filter module.

[0089] The first voltage conversion unit is used to rectify the input DC power, the second voltage conversion unit is used to convert the input AC power, and the third voltage conversion unit is used to rectify the input AC power. Through the cooperation of the first voltage conversion unit, the second voltage conversion unit and the third voltage conversion unit, the AC power input from the AC charging port can be converted into high voltage DC power (e.g., 800V), thereby realizing the charging of the battery.

[0090] In some embodiments, the second filtering module may include a second capacitor C2.

[0091] The following is combined Figure 4 The structure of the voltage conversion sub-circuit is described in detail.

[0092] like Figure 4 As shown, the first voltage conversion unit includes a fourth bridge arm and a fifth bridge arm, the second voltage conversion unit includes a sixth bridge arm and a seventh bridge arm, and the third voltage conversion unit includes a transformer T, a fourth inductor L4, a third capacitor C3, and a fourth capacitor C4.

[0093] The fourth bridge arm includes a seventh switch D7 and an eighth switch D8 connected in series, with the first end of the seventh switch D7 connected to the first end of the eighth switch D8. The common terminal of the seventh switch D7 and the eighth switch D8 is referred to as the midpoint of the fourth bridge arm.

[0094] The fifth bridge arm includes a ninth switch D9 and a tenth switch D10 connected in series, with the first end of the ninth switch D9 connected to the first end of the tenth switch D10. The common end of the ninth switch D9 and the tenth switch D10 is then referred to as the midpoint of the fifth bridge arm.

[0095] The sixth bridge arm includes an eleventh switch D11 and a twelfth switch D12 connected in series, with the first end of the eleventh switch D11 connected to the first end of the twelfth switch D12. The common end of the eleventh switch D11 and the twelfth switch D12 is then referred to as the midpoint of the sixth bridge arm.

[0096] The seventh bridge arm includes a thirteenth switch D13 and a fourteenth switch D14 connected in series, with the first end of the thirteenth switch D13 connected to the first end of the fourteenth switch D14. The common terminal of the thirteenth switch D13 and the fourteenth switch D14 is referred to as the midpoint of the seventh bridge arm.

[0097] The fourth bridge arm is connected in parallel with the fifth bridge arm. For example, the second end of the seventh switch D7 is connected to the second end of the ninth switch D9, and the second end of the eighth switch D8 is connected to the second end of the tenth switch D10.

[0098] The sixth bridge arm and the seventh bridge arm are connected in parallel. For example, the second end of the eleventh switch D11 is connected to the second end of the thirteenth switch D13, and the second end of the twelfth switch D12 is connected to the second end of the fourteenth switch D14.

[0099] The first end of the third capacitor C3 is connected to the midpoint of the fourth bridge arm, the second end of the third capacitor C3 is connected to the first end A (the opposite end on the low-voltage side) of the transformer T, the first end of the fourth inductor L4 is connected to the midpoint of the fifth bridge arm, and the second end of the fourth inductor L4 is connected to the second end B (the same end on the low-voltage side) of the transformer T.

[0100] The third terminal C (the same-name terminal on the high-voltage side) of the transformer T is connected to the first terminal of the fourth capacitor C4, the second terminal of the fourth capacitor C4 is connected to the midpoint of the seventh bridge arm, and the fourth terminal D (the opposite-name terminal on the high-voltage side) of the transformer T is connected to the midpoint of the seventh bridge arm.

[0101] In some embodiments, the fourth inductor L4 and the third capacitor C3 constitute an LC resonant cavity, when using Figure 4 When the voltage conversion sub-circuit shown is charging, it operates in the full-bridge LLC resonant converter mode. That is, the first voltage conversion unit, the LC resonant cavity, and the inductor in the transformer T of the voltage conversion sub-circuit constitute a full-bridge LLC resonant network, making the voltage conversion sub-circuit a full-bridge LLC resonant converter.

[0102] It should be understood that the fourth inductor L4 can be an inductor that exists independently of the transformer T, or it can be the leakage inductance in the transformer T. That is to say, the fourth inductor L4 and the transformer T can be independent devices, or they can be a component belonging to the transformer T. This application does not limit this.

[0103] In some embodiments, the electronic converter circuit may also be referred to as a bidirectional CLLC circuit.

[0104] In some embodiments, such as Figure 4 As shown, the first switching module includes a fifth switch K5, a sixth switch K6, and a seventh switch K7. By changing the on / off state of different switches, the current of different phases of the alternating current can be rectified and boosted.

[0105] Optionally, the switch described above can be a contactor (e.g., a high-voltage contactor) or a relay, etc. The embodiments of this application do not limit the type of switch.

[0106] The charging circuit provided in this application embodiment has AC charging function by setting a voltage conversion sub-circuit, thereby achieving AC / DC charging compatibility and further reducing the overall vehicle cost.

[0107] In some embodiments, the charging circuit further includes a second switching module and a third switching module. For example... Figure 5 As shown, the second switch module is connected in series with the first filter module between the positive output terminal and the negative output terminal of the bus, and the third switch module is deployed in the bus for connecting the DC charging port and the battery.

[0108] In some embodiments, the second switch module includes an eighth switch K8.

[0109] In some embodiments, the third switch module includes: a third sub-switch module, a third switch K3, a fourth switch K4, and a ninth switch K9. The third sub-switch module includes a first switch K1, a second switch K2, and a first resistor R1. The second switch K2 is connected in series with the first resistor R1 and then in parallel with the first switch K1. The third switch K3 is connected in series with the third switch module in the positive line to the busbar, and the fourth switch K4 and the ninth switch K9 are connected in series in the negative line of the busbar.

[0110] By changing the on / off state of each switch in the first, second, and third switch modules, the switching between AC and DC charging can be achieved.

[0111] Optionally, the first resistor R1 in the third sub-switch module can be a 0-ohm resistor. It should be understood that a 0-ohm resistor does not actually have a strictly zero resistance, but rather a value close to zero ohms, typically between 10 and 50 milliohms. By setting the first resistor R1, it can be used as a busbar protector, grounding point, etc., thereby improving the safety of the busbar.

[0112] Optionally, the switch described above can be a contactor (e.g., a high-voltage contactor) or a relay, etc. The embodiments of this application do not limit the type of switch.

[0113] In some embodiments, the charging circuit further includes a filter sub-circuit and a pre-charge sub-circuit.

[0114] The first end of the filter sub-circuit is connected to the AC charging port, the second end of the filter sub-circuit is connected to the first end of the pre-charging sub-circuit, and the second end of the pre-charging sub-circuit is connected to the first end of the first switching module.

[0115] Optionally, the filter sub-circuit can be an EMI circuit.

[0116] In the above methods, the pre-charging circuit can effectively reduce the damage to other components in the charging circuit (e.g., contactors) caused by excessive instantaneous current during power-on, thus improving charging safety. The filtering circuit can effectively reduce electromagnetic interference during AC charging.

[0117] The above embodiments have described the structure and principle of the charging circuit. The charging method for the vehicle provided in this application embodiment will be described below based on the above charging circuit.

[0118] Figure 6 This is a schematic flowchart of the vehicle charging method provided in the embodiments of this application, as shown below. Figure 6 As shown, it includes:

[0119] S601. When the vehicle is detected to be connected to the charging pile, the charging mode is determined according to the connected charging port; the charging mode includes DC charging mode and AC charging mode.

[0120] The execution subject of this application embodiment can be a vehicle control system, such as an on-board controller, a battery management system, etc.

[0121] In some embodiments, the vehicle's charging port includes two ports: a DC charging port and an AC charging port. Optionally, the DC charging port and the AC charging port can also be integrated into a single port.

[0122] Taking a vehicle with two charging ports as an example, when the control system detects that the vehicle is connected to a charging station, if it is connected to the DC charging port, it determines that the current charging mode needs to be used for charging; if it is connected to the AC charging port, it determines that the current charging mode needs to be used for charging.

[0123] Optionally, if the DC charging port and AC charging port can be integrated into a single port, the control system can communicate with the charging pile to determine the type of charging pile. The charging mode is then determined based on the type of charging pile. For example, if the charging pile is a DC charging pile, the charging mode is determined to be DC charging mode; if the charging pile is an AC charging pile, the charging mode is determined to be AC ​​charging mode.

[0124] S602. Obtain the charging strategy corresponding to the charging mode; the charging strategy is used to indicate the on / off state of the switching module in the charging circuit.

[0125] When the control system acquires a charging mode, it can retrieve the corresponding charging strategy from a preset charging strategy. Different charging strategies are used to indicate the on / off state of switches in each switching module of the charging circuit shown in the above embodiment. For example, the charging strategy corresponding to the AC charging mode is to close switches K1, K5, etc., while the charging strategy corresponding to the DC charging mode is to close switches K4, K9, etc.

[0126] S603. Control the corresponding switch module in the charging circuit to open or close according to the charging strategy.

[0127] When the control system obtains the charging strategy corresponding to the current charging mode, it controls the corresponding switch in the charging circuit to open or close according to the charging strategy to charge the vehicle's battery. It should be understood that a closed switch is in a conducting state, and an open switch is in a disconnected state.

[0128] In some embodiments, DC charging piles may include high-voltage DC charging piles and low-voltage DC charging piles, and AC charging piles may include single-phase AC charging piles and three-phase AC charging piles. Therefore, when the control system determines the charging mode, it also needs to obtain the corresponding charging strategy according to the specific type of the charging pile.

[0129] The process of acquiring specific charging strategies in DC charging mode and AC charging mode will be explained below.

[0130] In DC charging mode, the specific charging strategy can be as follows:

[0131] S1. Obtain the maximum output voltage of the charging pile.

[0132] The control system can communicate with the charging pile to obtain the maximum output voltage of the charging pile.

[0133] S2. If the maximum output voltage is greater than or equal to the preset voltage, the current charging mode is determined to be a high-voltage DC charging mode; if the maximum input voltage is less than the preset voltage, the current charging mode is determined to be a low-voltage DC charging mode.

[0134] For example, the preset voltage can be 800V. If the maximum output voltage is 1000V, which is greater than the preset voltage, then the current charging mode is set to high-voltage DC charging mode. If the maximum output voltage is 750V, which is less than the preset voltage, then the current charging mode is set to low-voltage DC charging mode.

[0135] S3. Control the corresponding switch module in the charging circuit to open or close according to the charging strategy corresponding to the high voltage DC charging mode or the low voltage DC charging mode.

[0136] The control system has preset charging strategies corresponding to the high-voltage DC charging mode and the low-voltage DC charging mode. The control system can obtain the corresponding charging strategy according to the determined DC charging mode and perform charging based on the corresponding charging strategy.

[0137] For example, with Figure 5 Taking the high-voltage DC charging mode and the low-voltage DC charging mode as examples, the charging strategies corresponding to each are explained respectively.

[0138] In low-voltage DC charging mode, such as Figure 5 As shown, the charging strategy involves closing switches K1, K4, K5, K6, K8, and K9, while the remaining switches are open (on). The charging pile current passes through the DC charging interface, then through inductors L1 / L2 / L3 and switching transistors D1 / D2 / D3 / D4 / D5 / D6 in the charging circuit. These three parallel and interleaved circuits increase the low-voltage current (e.g., 400V) to a high-voltage current (e.g., 800V). After passing through the filter capacitor C1, a stable voltage is obtained, ultimately charging the battery.

[0139] In high-voltage DC charging mode, such as Figure 5 As shown, the charging strategy involves closing switches K1, K3, K4, and K9, while the remaining switches are open (on). The charging pile current charges the battery through the DC charging interface and the busbar.

[0140] In AC charging mode, the specific charging strategy can be as follows:

[0141] A1. Obtain the type of AC power in the AC charging mode; the type includes single-phase AC power and three-phase AC power.

[0142] The control system can communicate with the charging pile to obtain the type of AC power supplied by the charging pile.

[0143] Optional, such as Figure 5 As shown, the control system can also measure the voltage between the wires L1, L2 and L3 of the AC charging port. If the voltage between any two wires is a preset voltage (e.g., 380V), it is determined to be three-phase AC power; otherwise, it is single-phase AC power.

[0144] A2. Determine the corresponding AC charging strategy based on the type of AC power.

[0145] The control system has preset charging strategies for the three-phase AC power and the single-phase AC power respectively. The control system can obtain the corresponding charging strategy according to the determined AC power type.

[0146] A3. Control the corresponding switch module in the charging circuit to open or close according to the AC charging strategy.

[0147] For example, with Figure 5 Taking one example, the charging strategies corresponding to three-phase AC power and single-phase AC power are explained respectively.

[0148] When the charging pile input is single-phase AC power, the charging strategy is to close switches K1, K5, K7, and K9.

[0149] The current from the charging pile passes through the AC charging port, EMI and pre-charging circuit, inductors L1 / L2 and switching transistors D1 / D2 / D3 / D4 / D5 / D6, and is rectified into DC by two parallel interleaved circuits. After being filtered by capacitor C1, the DC voltage is boosted (e.g., to 800V) by a voltage conversion sub-circuit, ultimately charging the battery.

[0150] When the charging pile input is three-phase AC power, the charging strategy is to close switches K and K9.

[0151] The charging pile current passes through the AC charging port, EMI and pre-charging circuit, inductors L1 / L2 / L3 and switching transistors D1 / D2 / D3 / D4 / D5 / D6, rectifies the AC power into DC power, filters it through capacitor C1, and then passes through a voltage conversion sub-circuit to boost the DC voltage (for example, to 800V), ultimately charging the battery.

[0152] In summary, the vehicle charging circuit and charging method provided in this application reuse the inductors L1 / L2 / L3, switching transistors D1 / D2 / D3 / D4 / D5 / D6, filter capacitor C1, and CLLC circuit in the integrated circuit according to different DC and AC charging piles. This achieves deep integration of AC and DC charging circuits, effectively reducing the cost and weight of the entire vehicle, while also effectively being compatible with low-voltage charging piles and improving the user experience.

[0153] Based on the above embodiments, this application also provides a charging device.

[0154] Figure 7 This is a schematic diagram of the structure of a charging device 70 provided in an embodiment of this application. The device is used to control a charging circuit as shown in any of the above embodiments, such as... Figure 7 As shown, it includes:

[0155] The detection module 701 is used to determine the charging mode based on the connected charging port when the vehicle is connected to the charging pile; the charging mode includes DC charging mode and AC charging mode.

[0156] The acquisition module 702 is used to acquire the charging strategy corresponding to the charging mode; the charging strategy is used to indicate the on / off state of the switching module in the charging circuit.

[0157] The control module 703 is used to control the corresponding switch module in the charging circuit to open or close according to the charging strategy.

[0158] Optionally, if the charging mode is a DC charging mode, the acquisition module 702 is further configured to acquire the maximum output voltage of the charging pile; if the maximum output voltage is greater than or equal to a preset voltage, the current charging mode is determined to be a high-voltage DC charging mode; if the maximum output voltage is less than the preset voltage, the current charging mode is determined to be a low-voltage DC charging mode.

[0159] Optionally, the control module 703 is also used to control the corresponding switch module in the charging circuit to open or close according to the charging strategy corresponding to the high voltage DC charging mode or the low voltage DC charging mode.

[0160] Optionally, if the charging mode is an AC charging mode, it is further used to obtain the type of AC power in the AC charging mode; the type includes single-phase AC power and three-phase AC power; and determine the corresponding AC charging strategy according to the type of AC power.

[0161] Optionally, the control module 703 is also used to control the corresponding switch module in the charging circuit to open or close according to the AC charging strategy.

[0162] The charging device provided in this application embodiment can perform the charging method provided in any of the above embodiments, and its principle and technical effect are similar, so it will not be described again here.

[0163] This application also provides an electronic device.

[0164] Figure 8 This is a schematic diagram of the structure of the electronic device 80 provided in an embodiment of this application. Figure 8 As shown, the electronic device may include: a transceiver 801, a processor 802, and a memory 803.

[0165] Processor 802 executes computer execution instructions stored in memory, causing processor 802 to perform the scheme in the above embodiments. Processor 802 can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components.

[0166] The memory 803 is connected to the processor 802 via the system bus and completes communication between them. The memory 803 is used to store computer program instructions.

[0167] The transceiver 801 can perform the functions of receiving and sending communication / control signals.

[0168] The system bus can be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. The system bus can be divided into address bus, data bus, control bus, etc. For ease of representation, only one thick line is used in the diagram, but this does not indicate that there is only one bus or one type of bus. Memory may include random access memory (RAM) and may also include non-volatile memory.

[0169] This application also provides a chip for executing instructions, which is used to execute the technical solution of the charging method in the above embodiments.

[0170] This application also provides a vehicle that includes a charging circuit as described in any of the above embodiments.

[0171] This application also provides a computer-readable storage medium storing a computer program thereon. When the computer program is executed by a processor, it implements the technical solution of the above-described charging method embodiment. Its implementation principle and technical effect are similar, and will not be repeated here.

[0172] In one possible implementation, a computer-readable medium may include random access memory (RAM), read-only memory (ROM), compact discread-only memory (CD-ROM) or other optical disc storage, disk storage or other magnetic storage devices, or any other medium targeted to carry or to store the required program code in the form of instructions or data structures, and accessible by a computer. Furthermore, any connection is appropriately referred to as a computer-readable medium. For example, if software is transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave, then coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of medium. As used herein, disks and optical discs include optical discs, laser discs, optical discs, Digital Versatile Discs (DVDs), floppy disks, and Blu-ray discs, where disks typically reproduce data magnetically, while optical discs optically reproduce data using lasers. The above combinations should also be included within the scope of computer-readable media.

[0173] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the technical solution of the above-described charging method embodiment. Its implementation principle and technical effects are similar and will not be repeated here.

[0174] In the specific implementation of the aforementioned terminal device or server, it should be understood that the processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), etc. A general-purpose processor can be a microprocessor or any conventional processor. The steps of the method disclosed in the embodiments of this application can be directly manifested as being executed by a hardware processor, or executed by a combination of hardware and software modules within the processor.

[0175] Those skilled in the art will understand that all or part of the steps in any of the above method embodiments can be implemented by hardware associated with program instructions. The aforementioned program can be stored in a computer-readable storage medium, and when the program is executed, all or part of the steps in the above method embodiments are performed.

[0176] If the technical solution of this application is implemented in software form and sold or used as a product, it can be stored in a computer-readable storage medium. Based on this understanding, all or part of the technical solution of this application can be embodied in the form of a software product, which is stored in a storage medium and includes a computer program or several instructions. This computer software product causes a computer device (which may be a personal computer, server, network device, or similar electronic device) to execute all or part of the steps of the method described in the embodiments of this application.

[0177] It should be noted that, for the sake of simplicity, the foregoing method embodiments are all described as a series of actions. However, those skilled in the art should understand that this application is not limited to the described order of actions, as some steps may be performed in other orders or simultaneously according to this application. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are all optional embodiments, and the actions and modules involved are not necessarily essential to this application.

[0178] It should be further noted that although the steps in the flowchart are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowchart may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the sub-steps or stages of other steps.

[0179] It should be understood that the above-described device embodiments are merely illustrative, and the device of this application can also be implemented in other ways. For example, the division of units / modules in the above embodiments is only a logical functional division, and there may be other division methods in actual implementation. For example, multiple units, modules, or components may be combined, or integrated into another system, or some features may be ignored or not executed.

[0180] Furthermore, unless otherwise specified, the functional units / modules in the various embodiments of this application can be integrated into one unit / module, or each unit / module can exist physically separately, or two or more units / modules can be integrated together. The integrated units / modules described above can be implemented in hardware or as software program modules.

[0181] When integrated units / modules are implemented in hardware, the hardware can be digital circuits, analog circuits, etc. The physical implementation of the hardware structure includes, but is not limited to, transistors, memristors, etc. Unless otherwise specified, the processor can be any suitable hardware processor, such as a CPU, GPU, FPGA, DSP, and ASIC, etc. Unless otherwise specified, the storage unit can be any suitable magnetic or magneto-optical storage medium, such as Resistive Random Access Memory (RRAM), Dynamic Random Access Memory (DRAM), Static Random Access Memory (SRAM), Enhanced Dynamic Random Access Memory (EDRAM), High-Bandwidth Memory (HBM), Hybrid Memory Cube (HMC), etc.

[0182] If the integrated unit / module is implemented as a software program module and sold or used as an independent product, it can be stored in a computer-readable storage device (CMD). Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a memory and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this application. The aforementioned memory includes various media capable of storing program code, such as a USB flash drive, read-only memory (ROM), random access memory (RAM), portable hard drive, magnetic disk, or optical disk.

[0183] In the above embodiments, the descriptions of each embodiment have their own emphasis. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments. The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification.

[0184] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A charging circuit of a vehicle, characterized by, The application relates to a charging circuit. The charging circuit comprises a direct-current charging port, a three-bridge-arm subcircuit and a first filter module. The three-bridge-arm subcircuit comprises a first bridge arm, a second bridge arm and a third bridge arm, a first inductor, a second inductor and a third inductor. The first bridge arm comprises a first switch tube and a second switch tube connected in series, the second bridge arm comprises a third switch tube and a fourth switch tube connected in series, and the third bridge arm comprises a fifth switch tube and a sixth switch tube connected in series. The direct-current charging port is connected with the first end of the first inductor, the first end of the second inductor and the first end of the third inductor respectively; the second end of the first inductor and the midpoint of the first bridge arm are connected, the second end of the second inductor and the midpoint of the second bridge arm are connected, and the second end of the third inductor and the midpoint of the third bridge arm are connected. The first filter module is connected in parallel with the first bridge arm, the second bridge arm and the third bridge arm between the positive output end and the negative output end of a bus. The charging circuit further comprises a second switch module and a third switch module. The second switch module is connected in series with the first filter module between the positive output end and the negative output end of the bus, and the third switch module is arranged in the bus for connecting the direct-current charging port and a battery. The third switch module comprises a third sub-switch module, a third switch, a fourth switch and a ninth switch, and the third sub-switch module comprises a first switch, a second switch and a first resistor. The second switch is connected in series with the first resistor and is connected in parallel with the first switch. The third switch is arranged in series with the third sub-switch module in the positive electrode circuit of the bus, and the fourth switch is arranged in series with the ninth switch in the negative electrode circuit of the bus. The charging circuit further comprises an alternating-current charging port, a first switch module and a voltage conversion subcircuit. The alternating-current charging port is connected with the first end of the first switch module, and the second end of the first switch module is connected with the first end of the first inductor, the first end of the second inductor and the first end of the third inductor respectively. The voltage conversion subcircuit is connected in parallel with the first filter module between the positive output end and the negative output end of the bus. The first end of the first switch module is also connected with the direct-current charging port.

2. The charging circuit of claim 1, wherein, The voltage conversion subcircuit comprises a first voltage conversion unit, a second voltage conversion unit, a third voltage conversion unit and a second filter module. The third voltage conversion unit is connected with the first voltage conversion unit and the second voltage conversion unit respectively, the second voltage conversion unit is connected in parallel with the second filter module, and the first voltage conversion unit is connected in parallel with the first filter module.

3. The charging circuit of claim 2, wherein, The first voltage conversion unit comprises a fourth bridge arm and a fifth bridge arm, the second voltage conversion unit comprises a sixth bridge arm and a seventh bridge arm, and the third voltage conversion unit comprises a transformer, a fourth inductor, a third capacitor and a fourth capacitor. The fourth bridge arm comprises a seventh switch tube and an eighth switch tube connected in series, the fifth bridge arm comprises a ninth switch tube and a tenth switch tube connected in series, the sixth bridge arm comprises an eleventh switch tube and a twelfth switch tube connected in series, and the seventh bridge arm comprises a thirteenth switch tube and a fourteenth switch tube connected in series. The fourth inductor and the third capacitor are connected with a low-voltage side of the transformer respectively, and the fourth capacitor is connected with a high-voltage side of the transformer. The fourth inductor is connected with a midpoint of the fifth bridge arm, the third capacitor is connected with a midpoint of the fourth bridge arm, the fourth capacitor is connected with a midpoint of the seventh bridge arm, and the high-voltage side of the transformer is connected with a midpoint of the sixth bridge arm.

4. The charging circuit according to any one of claims 2-3, characterized in that, The charging circuit further comprises a filtering sub-circuit and a pre-charging sub-circuit. A first end of the filtering sub-circuit is connected with the alternating current charging port, a second end of the filtering sub-circuit is connected with a first end of the pre-charging sub-circuit, and a second end of the pre-charging sub-circuit is connected with a first end of the first switch module.

5. A charging method of a vehicle characterized by, The method is used for controlling the charging circuit as claimed in any one of claims 1-4, and the method comprises: When it is detected that the vehicle is connected with the charging pile, a charging mode is determined according to the connected charging port; the charging mode comprises a direct current charging mode and an alternating current charging mode; A charging strategy corresponding to the charging mode is acquired; the charging strategy is used for indicating on-off states of switch modules in the charging circuit; The corresponding switch modules in the charging circuit are controlled to be opened or closed according to the charging strategy.

6. The method of claim 5, wherein, If the charging mode is the direct current charging mode, the method further comprises: A maximum output voltage of the charging pile is acquired; If the maximum output voltage is greater than or equal to a preset voltage, it is determined that a current charging mode is a high-voltage direct current charging mode; if the maximum output voltage is less than the preset voltage, it is determined that the current charging mode is a low-voltage direct current charging mode; The corresponding switch modules in the charging circuit are controlled to be opened or closed according to a charging strategy corresponding to the high-voltage direct current charging mode or the low-voltage direct current charging mode.

7. The method of claim 5, wherein, If the charging mode is the alternating current charging mode, the method further comprises: A type of alternating current in the alternating current charging mode is acquired; the type comprises single-phase alternating current and three-phase alternating current; According to the type of alternating current, a corresponding alternating current charging strategy is determined; The corresponding switch modules in the charging circuit are controlled to be opened or closed according to the alternating current charging strategy.

8. A vehicle characterized by comprising: The charging circuit as claimed in any one of claims 1-4 is comprised.

9. A computer-readable storage medium, characterized in that, A computer program is stored thereon, and the computer program is executed by a processor to implement the method as claimed in any one of claims 5-7.

10. A computer program product, characterised in that, A computer program is comprised, and the computer program is executed by a processor to implement the method as claimed in any one of claims 5-7.

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